Page 27 - Steel Tech India eMagazine Volume April 2022

VOL. 16 • NO. 3 • April 2022

the above XRD plot shows, sludge from steel melting
shop contains hematite (Fe O ) as major phase. the
3
2
dust collected from steel melting shop sludge pondalso
contains alumina (Al O )and magnetite (Fe O ) as
2
4
3
3
minor prominent peaks. this means that hematite
is the major mineral phase present in sludge of steel
melting shop and iron (Fe) is the element which can be
extracted from these dusts.
WDXRF Analysis

Table 2: Showing the WDXRF analysis data of steel
Fig. 4: X-ray diffraction analysis plot for sludge dust melting shop sludge
from steel melting shop

Sl Name of Chemical Composition (%)
no. Sample
T.Fe SiO Al O P O S Mn CaO MgO
2 2 3 2 5
1 SMS Sludge 55.546 2.864 0.64 0.139 0.073 0.271 6.454 0.863

Waste dusts from sinter plant contain total iron around c) Coke Dust
56 %, silica around 3 %, lime around 6 % and other Proximate and Ultimate Analysis
elements & compounds are in traceable amount as
depicted in the table no. 2. the proximate analysis of the coke dust sample from
VSP is performed by a standard proximate analyzer is
Proximate Analysis
tabulated in table 3.
carbon content in SMS sludge dust is 0.66 %.

Table 3 : Proximate analysis report of coke dust

Sample Total Moisture (%) Volatile Matter (%) Ash Content (%) Fixed Carbon (%)

Coke Dust 1.5 1.2 18.71 80.09

the ultimate analysis of the coke dust sample from 99.99 % N ) from room temperature to 1273 K and it
2
VSP is performed by a standard ultimate analyzer has been depicted in figure no. 5. there is hardly any
(lecotruSpec) is tabulated in table no. 4. weight loss up to about 873 K. this is attributed to the

Table 4 : Ultimate analysis report of coke dust very low content of moisture and volatile matter in coke
dust. thereafter, a gradual weight loss after 873 K
Sample Carbon Hydrogen Nitrogen
0
(%) (%) (%) (600° c) is observed. It may be noted that the apparent
Coke Dust 87.5 0.065 1.351 pores of the fine coke dust are filled with air and
second the nitrogen used is not fully free from oxygen.
therefore, oxygen from both the sources is responsible
TG/DT Analysis
for burning of coke dust at high temperature which
thermo Gravimetric - Differential thermal (tG/Dt) gives rise to an exothermic peak in the DtA analysis at
Analysis of the coke dust is performed by tG-DtA, around 923–1123 K.
Parkin elmer under nitrogen atmosphere (UhP Grade

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